Amplifiers – With semiconductor amplifying device – Including frequency-responsive means in the signal...
Patent
1998-06-12
1999-07-06
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including frequency-responsive means in the signal...
330306, H03F 304
Patent
active
059202327
ABSTRACT:
A compensated, bias-dependent signal filtration and amplification circuit includes a low-pass RC filter with a bias-dependent frequency response caused by the use of MOS transistors connected as capacitors with bias-dependent capacitances. A dc current source is used, in cooperation with the resistors of the RC filter, to generate a fixed bias for the capacitor-connected MOS transistors and thereby eliminate the bias dependencies of the capacitances. Following amplification of the filtered signal, another dc current is subtracted out from the amplified output signal so as to eliminate any residual dc signal components due to the input compensation dc bias signal, thereby leaving only the amplified filtered ac signal components.
REFERENCES:
patent: 4843343 (1989-06-01), Pace
patent: 5241284 (1993-08-01), Nyqvist et al.
patent: 5412335 (1995-05-01), Jackson et al.
patent: 5666086 (1997-09-01), Klein
National Semiconductor Corporation
Nguyen Patricia
Pascal Robert
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